Heya, here's no$zx v2.0.
The program has originally started as a two-weeks hack for emulating the ZX81,
but now grew to a decent six-months project.
Aside from improved ZX80/ZX81 emulation, it's now also supporting the Lambda
and Jupiter ACE, alongsides with the complete ZX Spectrum series
(though the older monochrome sinclair models are still looking
more fascinating to me).

My ZX81 with installed sound expansion (an old doorbell which looks
almost as if was produced explicitely for this computer,
though the sparkling and rattling bell has some negative influences
on the power supply and tends to crash the CPU after soon).
And, with centronics port (for high-speed cassette software uploads from PC).